Bug 1868006

Summary: python38: Support for alternative architectures' names in Python importlib
Product: Red Hat Enterprise Linux 8 Reporter: Lumír Balhar <lbalhar>
Component: python38Assignee: Lumír Balhar <lbalhar>
Status: CLOSED ERRATA QA Contact: Lukáš Zachar <lzachar>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 8.0CC: cstratak, pviktori, rhel-cs-apps-subsystem-qe, torsava
Target Milestone: betaKeywords: Reproducer, Triaged
Target Release: 8.4Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: python38-3.8.6-2.module+el8.4.0+9001+fc421f6c Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of: 1868003 Environment:
Last Closed: 2021-05-18 15:53:56 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1868003    
Bug Blocks:    

Description Lumír Balhar 2020-08-11 11:50:48 UTC 
+++ This bug was initially created as a clone of Bug #1868003 +++

I have recently discovered that our Pythons in Fedora and RHEL are configured in a different way than upstream and some other distributions. The difference is in names for some architectures — for example, for 64 bit PowerPC, Fedora and RHEL use "ppc64" but CPython upstream, Debian, SUSE, etc. use "powerpc64".

This difference causes trouble with universal manylinux wheels. For example, simple-manylinux-demo produces a wheel for PowerPC with a built extension module. The module has powerpc64le in its name and therefore Python interpreters on RHEL cannot find it and import it.

The plan is to patch all Python interpreters in RHEL to be compatible with the upstream and downstream names at the same time and then we will remove the patch causing the difference.

This is already fixed in Fedora, for example https://src.fedoraproject.org/rpms/python3.9/c/898f7432fb5857a33df7360d48aff9f8fcba03f8?branch=master

Further reading: https://github.com/pypa/manylinux/issues/687
Comment 1 Petr Viktorin (pviktori) 2020-08-12 12:21:47 UTC 
To test this, install and run the third-party Numpy package on ppc64le. The test currently exists (I'm not sure where) but is failing.
Comment 2 Lumír Balhar 2020-08-13 06:27:36 UTC 
This can wait for RHEL 8.4.0 because it needs some time in Fedora first.

The change is ready in https://src.osci.redhat.com/rpms/python38/c/39c2cf50cf9227125068160bdf0aac901cf8e90f?branch=private-lbalhar-stream-3.8-rhel-8.4.0
Scratch build: https://mbsweb.engineering.redhat.com/module/7653

Verification:

old:

# python3.8 -c "import sys; print(sys.path_importer_cache['/usr/lib64/python3.8']._loaders)"
[('.cpython-38-ppc64le-linux-gnu.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.abi3.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.py', <class '_frozen_importlib_external.SourceFileLoader'>), ('.pyc', <class '_frozen_importlib_external.SourcelessFileLoader'>)]

new:

# python3.8 -c "import sys; print(sys.path_importer_cache['/usr/lib64/python3.8']._loaders)"
[('.cpython-38-ppc64le-linux-gnu.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.abi3.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.cpython-38-powerpc64le-linux-gnu.so', <class '_frozen_importlib_external.ExtensionFileLoader'>), ('.py', <class '_frozen_importlib_external.SourceFileLoader'>), ('.pyc', <class '_frozen_importlib_external.SourcelessFileLoader'>)]

# pip3.8 install simple.manylinux-demo
# python3.8 -m unittest discover dummyextension.tests
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
Comment 5 Lumír Balhar 2020-11-03 10:48:34 UTC 
The change is ready but untested in https://src.osci.redhat.com/rpms/python38/c/c3c61d86034bad1237818a45a5cd691aff301f5c?branch=private-lbalhar-stream-3.8-rhel-8.4.0

I cannot test it because I cannot rebuild Python 38 module because of a problem with dependencies collision between baseos and the module described in https://projects.engineering.redhat.com/browse/RHELBLD-3128
Comment 6 Lumír Balhar 2020-12-02 08:41:42 UTC 
Module scratch build: https://mbsweb.engineering.redhat.com/module/8914
Python 3.8 component: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=33406200

PR: https://src.osci.redhat.com/rpms/python38/pull-request/5

Verification:

Old version (python38-3.8.3-3.module+el8.3.0+7680+79e7e61a.ppc64le)

# python3.8 -m venv venv
source venv/bin/activate
# source venv/bin/activate
(venv) # pip install -U pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/55/73/bce122d1ed0217b3c1a3439ab16dfa94bbeabd0d31755fcf907493abf39b/pip-20.3-py2.py3-none-any.whl (1.5MB)
     |████████████████████████████████| 1.5MB 1.8MB/s 
Installing collected packages: pip
  Found existing installation: pip 19.3.1
    Uninstalling pip-19.3.1:
      Successfully uninstalled pip-19.3.1
Successfully installed pip-20.3
(venv) # pip install simple-manylinux-demo
Collecting simple-manylinux-demo
  Downloading simple_manylinux_demo-1.0-cp38-cp38-manylinux2014_ppc64le.whl (17 kB)
Installing collected packages: simple-manylinux-demo
Successfully installed simple-manylinux-demo-1.0
(venv) # ls -la venv/lib/python3.8/site-packages/dummyextension/
total 120
drwxr-xr-x.  4 root root  4096 Dec  2 08:28 .
drwxr-xr-x. 10 root root  4096 Dec  2 08:28 ..
-rw-r--r--.  1 root root     0 Dec  2 08:28 __init__.py
drwxr-xr-x.  2 root root  4096 Dec  2 08:28 __pycache__
-rwxr-xr-x.  1 root root 89176 Dec  2 08:28 extension.cpython-38-powerpc64le-linux-gnu.so
drwxr-xr-x.  3 root root  4096 Dec  2 08:28 tests
(venv) # python
Python 3.8.3 (default, Aug 18 2020, 12:58:59) 
[GCC 8.3.1 20191121 (Red Hat 8.3.1-5)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from dummyextension import extension
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'extension' from 'dummyextension' (/venv/lib64/python3.8/site-packages/dummyextension/__init__.py)
>>> import sysconfig
>>> sysconfig.get_config_var("EXT_SUFFIX")
'.cpython-38-ppc64le-linux-gnu.so'

New version (python38-3.8.6-2.scrmod+el8.4.0+8900+a7d53920.ppc64le)

# python3.8 -m venv venv
# source venv/bin/activate
(venv) # pip install -U pip
Collecting pip
  Using cached https://files.pythonhosted.org/packages/55/73/bce122d1ed0217b3c1a3439ab16dfa94bbeabd0d31755fcf907493abf39b/pip-20.3-py2.py3-none-any.whl
Installing collected packages: pip
  Found existing installation: pip 19.3.1
    Uninstalling pip-19.3.1:
      Successfully uninstalled pip-19.3.1
Successfully installed pip-20.3
(venv) # pip install simple-manylinux-demo
Collecting simple-manylinux-demo
  Using cached simple_manylinux_demo-1.0-cp38-cp38-manylinux2014_ppc64le.whl (17 kB)
Installing collected packages: simple-manylinux-demo
Successfully installed simple-manylinux-demo-1.0
(venv) # python
Python 3.8.6 (default, Dec  1 2020, 07:56:20) 
[GCC 8.4.1 20200928 (Red Hat 8.4.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from dummyextension import extension
>>> import sysconfig
>>> sysconfig.get_config_var("EXT_SUFFIX")
'.cpython-38-ppc64le-linux-gnu.so'
>>> 
(venv) # git clone https://github.com/frenzymadness/simple-manylinux-demo.git
(venv) # cd simple-manylinux-demo/
(venv) # python setup.py build
(venv) # ls -la build
total 32
drwxr-xr-x. 4 root root 4096 Dec  2 08:33 .
drwxr-xr-x. 5 root root 4096 Dec  2 08:33 ..
drwxr-xr-x. 3 root root 4096 Dec  2 08:33 lib.linux-ppc64le-3.8
drwxr-xr-x. 3 root root 4096 Dec  2 08:33 temp.linux-ppc64le-3.8
(venv) # ls -la build/lib.linux-ppc64le-3.8/dummyextension/
total 56
drwxr-xr-x. 3 root root  4096 Dec  2 08:33 .
drwxr-xr-x. 3 root root  4096 Dec  2 08:33 ..
-rw-r--r--. 1 root root     0 Dec  2 08:33 __init__.py
-rwxr-xr-x. 1 root root 89368 Dec  2 08:33 extension.cpython-38-ppc64le-linux-gnu.so
drwxr-xr-x. 2 root root  4096 Dec  2 08:33 tests

(venv) # PYTHONPATH=build/lib.linux-ppc64le-3.8/dummyextension/ python
Python 3.8.6 (default, Dec  1 2020, 07:56:20) 
[GCC 8.4.1 20200928 (Red Hat 8.4.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import extension
>>>
Comment 7 Lumír Balhar 2020-12-03 09:40:49 UTC 
The PR is merged. I'm gonna rebuild the module together with other fixes later.
Comment 13 errata-xmlrpc 2021-05-18 15:53:56 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: python38:3.8 security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:1879